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fuel or electronic problem??? HELP!

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Old 01-16-2010, 09:17 PM   #1
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Question fuel or electronic problem??? HELP!

I have a 2004 f-150 xlt, 5.4liter V-8 automatic. Recently something aggravating started happening. I noticed my engine speed at idle was gettin really low, especially when in gear. Well, I went ahead and went down the road. When I got where I was going and stopped my truck I hadn't even taken it out of drive yet, and the RPM's dropped way down below normal, and the damn thing quit. Now it does it every time I stop if I don't feather the fuel while I'm sitting still. I haven't had a check engine light, I put my programmer on and checked for DTCs and none. I changed the fuel filter and that didn't help either, it acts exactly like the idle air control, or throttle position sensor but why would it not throw a code? Has this ever happened to anyone here, I don't know what to check next before I take it to the dealer and get raped with no lube.
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Old 01-16-2010, 09:25 PM   #2
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Check to see if your throttle body is dirty and binding.
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Old 01-17-2010, 02:21 AM   #3
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Question how?

Hey, I appreciate the reply. I was wondering, I have an AFE cold air intake, and a throttle body spacer, is their anything in particular on either one of them it could be. And also by,"Check to see if it is binded" what should I be lookin for on the throttle body, a vacuum or something? thanx
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Old 01-18-2010, 10:29 AM   #4
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The throttle body has a butterfly valve that controls the airflow into the engine. Sometimes dirt and oil can buildup and not let the valve move freely.
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